I have met yet another problem in allegro GL. I have started work on the 3d modeling system, and have gotten the V*E*R*Y basics of the model classes together. But, when I try and render them, the models (only flat polygons for now) are only visible from one side. So that if I walk arround the object, it disapears. I have turned my head inside out, bu still cant find the reason. I'm sure I am missing something fundamental...

And just to make sure:

Dev-C++, allegro 3937, Allgro GL 0.0.25
C++
win98se

What you are experiencing is called "backface culling". It's actually quite useful. This makes it so that any outward surfaces of a closed object are not drawn when they are not needed to be. (in lamens terms, any polygon whose perpendicular line [the normal] that is facing away from the screen will not be drawn).

This way if you create a closed 3d object that has all of it's polygons facing inward (like a cube or a boxed car), the processor ins't waisted on the polygons that it'll draw over anyway.

Ok sorry for explaining what you probably don't care about here's the code to turn it off :-)

//Call these to turn off the backface culling defaults
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glDisable(GL_CULL_FACE);

//To bring it back, I use these calls
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);

yeah thanks for finding all my bugs.. yes I know about them.. I know about them all .... hahahhahhahhaha, I tried to fix it, but I guess it wasn't completely fixed... it lies in the deleting of a linked list node.. and it's either if you right click after.. or before the last tile on the map. Basically I messed up the whole linked list thing by allocating a node as the base node first.. when it's simpler to just do head=NULL; I'll fix it when I get back to it after finishing my GUI.. which looks like next year sometime at teh rate I'm going.. but if anyone want's to add to my GUI, just e-mail me the changes and if I like them it will become part of the release, of course it's freeware anyway, you can change it on your machine all you want.

Backface culling helps when you have a polygon object that's not a single plane, that way you are not rendering useless stuff you will never see.

I was thinking a multiple line text editor, console (terminal), um maybe an amp player if you link with fmod.. and possibly a DUMB wrapper, but I have never used DUMB.. maybe someone else can write that up, I know with fmod I have access to the DSP for an equalizer. Right now i'm adding another skin.. I do this just to see if I have any downsides.. it's BorgX for NEXTstart.. hasn't been easy and I need to add more functionality to make it look right.. shouldn't be to hard though.. it's stuff I knew about already. What I really need to get started on is some Dialog routines that are not dependent on x and y coordinates, similar to my menu, like an array of buttons, and attaching them to the dialog so it can be resized and they will be "attached" to an edge.